You can easily see your back palate working by opening your mouth wide and giving yourself the sensation of one about to sneeze. You will see far back in the throat, way behind the nose, a soft spot that will draw up of itself as the sneeze becomes more imminent. That little point is the soft palate. It must be drawn up for the high notes in order to get the head resonance. As a singer advances in her art she can do this at will.
The adjustment of throat, tongue and palate, all working together, will daily respond more easily to her demands. However, she should be able consciously to control each part by itself.
The conscious direction of the voice and command of the throat are necessary. Frequently in opera the singer, sitting or lying in some uncomfortable position which is not naturally convenient for producing the voice, will consciously direct her notes into the head cavities by opening up the throat and lifting the soft palate. For instance, in the rôle of Violetta the music of the last act is sung lying down. In order to get proper resonance to some of the high notes I have to start them in the head cavity by means, of course, of the apoggio, or breath prop, without which the note would be thin and would have no body to it.
The sensation that I have is of a slight pressure of breath striking almost into a direct line into the cavity behind the forehead over the eyes without any obstruction or feeling in the throat at all.
This is the correct attack for the head tone, or a tone taken in the upper register. Before I explain the registers to you I must tell you one of the funniest compliments I ever received. A very flattering person was comparing my voice to that of another high soprano whom I very much admire.
"Her voice is beautiful, particularly in the upper register," I insisted when the other lady was being criticized.
"Ah, madame," responded the flattering critic, "but your registers give out so much more warmth."
I think this joke is too good to lose, also the criticism, while unjust to the other singer, is interesting to the student, because in the high register, which includes in some voices all the notes above middle C, the notes are thin and cold unless supported by the apoggio, the breath prop, of which I have told you so much. People ask whether there are such things as vocal registers. Certainly there are. There are three always and sometimes four in very high voices. The ordinary registers are the low, the middle, the high voice, or head voice, and sometimes the second high voice, which has been called the flagellant voice.
A vocal register is a series of tones which are produced by a certain position of the larynx, tongue and palate. In the woman's voice the middle register takes in the notes from E on the first line of the staff about to middle C. The head voice begins at middle C and runs up sometimes to the end of the voice, sometimes to B flat or C, where it joins the second head register, which I have heard ascend into a whistle in phenomenal voices cultivated only in this register and useless for vocal work.